<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  
  <title>SocketChannel文件拷贝 | Hexo</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
  <meta name="description" content="简介　　上一篇我们介绍了FileChannel进行文件拷贝的方法和优势，现在我们将结合FileChannel和SocketChannel进行网络级别的文件拷贝工作。下面示例的功能为服务端收到客户端发送的文件后，再给客户端发送一个文件。
服务端1234567891011121314151617181920212223242526272829303132333435363738394041424344">
<meta property="og:type" content="article">
<meta property="og:title" content="SocketChannel文件拷贝">
<meta property="og:url" content="http://yoursite.com/2015/12/23/nio/5.SocketChannel文件拷贝/index.html">
<meta property="og:site_name" content="Hexo">
<meta property="og:description" content="简介　　上一篇我们介绍了FileChannel进行文件拷贝的方法和优势，现在我们将结合FileChannel和SocketChannel进行网络级别的文件拷贝工作。下面示例的功能为服务端收到客户端发送的文件后，再给客户端发送一个文件。
服务端1234567891011121314151617181920212223242526272829303132333435363738394041424344">
<meta property="og:updated_time" content="2016-01-29T17:47:36.000Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="SocketChannel文件拷贝">
<meta name="twitter:description" content="简介　　上一篇我们介绍了FileChannel进行文件拷贝的方法和优势，现在我们将结合FileChannel和SocketChannel进行网络级别的文件拷贝工作。下面示例的功能为服务端收到客户端发送的文件后，再给客户端发送一个文件。
服务端1234567891011121314151617181920212223242526272829303132333435363738394041424344">
  
    <link rel="alternative" href="/atom.xml" title="Hexo" type="application/atom+xml">
  
  
    <link rel="icon" href="/favicon.png">
  
  <link href="//fonts.googleapis.com/css?family=Source+Code+Pro" rel="stylesheet" type="text/css">
  <link rel="stylesheet" href="/css/style.css" type="text/css">
  

</head>
<body>
  <div id="container">
    <div id="wrap">
      <header id="header">
  <div id="banner"></div>
  <div id="header-outer" class="outer">
    <div id="header-title" class="inner">
      <h1 id="logo-wrap">
        <a href="/" id="logo">Hexo</a>
      </h1>
      
    </div>
    <div id="header-inner" class="inner">
      <nav id="main-nav">
        <a id="main-nav-toggle" class="nav-icon"></a>
        
          <a class="main-nav-link" href="/">Home</a>
        
          <a class="main-nav-link" href="/archives">Archives</a>
        
      </nav>
      <nav id="sub-nav">
        
          <a id="nav-rss-link" class="nav-icon" href="/atom.xml" title="RSS Feed"></a>
        
        <a id="nav-search-btn" class="nav-icon" title="Search"></a>
      </nav>
      <div id="search-form-wrap">
        <form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form"><input type="search" name="q" results="0" class="search-form-input" placeholder="Search"><button type="submit" class="search-form-submit">&#xF002;</button><input type="hidden" name="sitesearch" value="http://yoursite.com"></form>
      </div>
    </div>
  </div>
</header>
      <div class="outer">
        <section id="main"><article id="post-nio/5.SocketChannel文件拷贝" class="article article-type-post" itemscope itemprop="blogPost">
  <div class="article-meta">
    <a href="/2015/12/23/nio/5.SocketChannel文件拷贝/" class="article-date">
  <time datetime="2015-12-22T21:00:00.000Z" itemprop="datePublished">2015-12-23</time>
</a>
    
  <div class="article-category">
    <a class="article-category-link" href="/categories/nio/">nio</a>
  </div>

  </div>
  <div class="article-inner">
    
    
      <header class="article-header">
        
  
    <h1 class="article-title" itemprop="name">
      SocketChannel文件拷贝
    </h1>
  

      </header>
    
    <div class="article-entry" itemprop="articleBody">
      
        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　上一篇我们介绍了FileChannel进行文件拷贝的方法和优势，现在我们将结合FileChannel和SocketChannel进行网络级别的文件拷贝工作。下面示例的功能为服务端收到客户端发送的文件后，再给客户端发送一个文件。</p>
<h2 id="u670D_u52A1_u7AEF"><a href="#u670D_u52A1_u7AEF" class="headerlink" title="服务端"></a>服务端</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyServer</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        Selector selector = <span class="keyword">null</span>;</span><br><span class="line">        ServerSocketChannel serverSocketChannel = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            selector = Selector.open();</span><br><span class="line"></span><br><span class="line">            serverSocketChannel = ServerSocketChannel.open();</span><br><span class="line">            serverSocketChannel.configureBlocking(<span class="keyword">false</span>);</span><br><span class="line"></span><br><span class="line">            serverSocketChannel.socket().setReuseAddress(<span class="keyword">true</span>);</span><br><span class="line">            serverSocketChannel.socket().bind(<span class="keyword">new</span> InetSocketAddress(<span class="number">10000</span>));</span><br><span class="line">            <span class="comment">//我们将ServerSocketChannel注册到了Selector中</span></span><br><span class="line">            serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);</span><br><span class="line"></span><br><span class="line">            <span class="comment">//select为一个阻塞方法，如要返回，需要满足以下任意一个条件</span></span><br><span class="line">            <span class="comment">// 1. 注册的某个channel状态与intersets一致了</span></span><br><span class="line">            <span class="comment">// 2. Selector的wakeup方法被调用了</span></span><br><span class="line">            <span class="comment">// 3. 当前的线程被中断了</span></span><br><span class="line">            <span class="comment">//服务端启动后，一直阻塞，直到有客户端建立连接，此时返回1</span></span><br><span class="line">            <span class="comment">//每次有新的客户端连接，都会影响select的返回值</span></span><br><span class="line">            <span class="keyword">while</span> (selector.select() &gt; <span class="number">0</span>) &#123;</span><br><span class="line">                <span class="comment">//客户端连接，导致ServerSocketChannel的状态为Accept，返回</span></span><br><span class="line">                Iterator&lt;SelectionKey&gt; it = selector.selectedKeys().iterator();</span><br><span class="line">                <span class="keyword">while</span> (it.hasNext()) &#123;</span><br><span class="line">                    SelectionKey readyKey = it.next();</span><br><span class="line">                    it.remove();</span><br><span class="line">                    <span class="comment">//故此处可以强转为ServerSocketChannel</span></span><br><span class="line">                    copy((ServerSocketChannel) readyKey.channel());</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Exception ex) &#123;</span><br><span class="line">            ex.printStackTrace();</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                selector.close();</span><br><span class="line">                serverSocketChannel.close();</span><br><span class="line">            &#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">copy</span><span class="params">(<span class="keyword">final</span> ServerSocketChannel serverSocketChannel)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        SocketChannel socketChannel = <span class="keyword">null</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="comment">//accept为每个新客户端的连接创建一个SocketChannel</span></span><br><span class="line">            <span class="comment">//以后服务端采用该SocketChannel与该客户端通信</span></span><br><span class="line">            socketChannel = serverSocketChannel.accept();</span><br><span class="line"></span><br><span class="line">            <span class="comment">//获取客户端发送的文件，保存到c:/server_receive.png</span></span><br><span class="line">            receiveFile(socketChannel, <span class="keyword">new</span> File(<span class="string">"c:/server_receive.png"</span>));</span><br><span class="line"></span><br><span class="line">            <span class="comment">//发送文件c:/server_send.png到客户端</span></span><br><span class="line">            sendFile(socketChannel, <span class="keyword">new</span> File(<span class="string">"c:/server_send.png"</span>));</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                socketChannel.close();</span><br><span class="line">            &#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">receiveFile</span><span class="params">(SocketChannel socketChannel, File file)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        FileChannel fileWriteChannel = <span class="keyword">null</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            fileWriteChannel = <span class="keyword">new</span> FileOutputStream(file).getChannel();</span><br><span class="line">            <span class="comment">//buffer为写模式</span></span><br><span class="line">            ByteBuffer buffer = ByteBuffer.allocateDirect(<span class="number">1024</span>);</span><br><span class="line"></span><br><span class="line">            <span class="keyword">int</span> size = <span class="number">0</span>;</span><br><span class="line">            <span class="comment">//socketChannel读取数据，写到buffer中</span></span><br><span class="line">            <span class="keyword">while</span> ((size = socketChannel.read(buffer)) != -<span class="number">1</span>) &#123;</span><br><span class="line">                <span class="comment">//buffer切换到读模式</span></span><br><span class="line">                buffer.flip();</span><br><span class="line">                <span class="keyword">if</span> (size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">                    buffer.limit(size);</span><br><span class="line">                    fileWriteChannel.write(buffer);</span><br><span class="line">                    <span class="comment">//buffer切换到写模式</span></span><br><span class="line">                    buffer.clear();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123; fileWriteChannel.close();&#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">sendFile</span><span class="params">(SocketChannel socketChannel, File file)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        FileChannel channel = <span class="keyword">null</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            channel = <span class="keyword">new</span> FileInputStream(file).getChannel();</span><br><span class="line">            ByteBuffer buffer = ByteBuffer.allocateDirect(<span class="number">1024</span>);</span><br><span class="line">            <span class="keyword">int</span> size = <span class="number">0</span>;</span><br><span class="line">            <span class="keyword">while</span> ((size = channel.read(buffer)) != -<span class="number">1</span>) &#123;</span><br><span class="line">                <span class="comment">//rewind和limit可以合并为flip方法</span></span><br><span class="line">                buffer.rewind();</span><br><span class="line">                buffer.limit(size);</span><br><span class="line">                socketChannel.write(buffer);</span><br><span class="line">                buffer.clear();</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">//直接优化为下面的方式</span></span><br><span class="line">            <span class="comment">//channel.transferTo(0, channel.size(), socketChannel);</span></span><br><span class="line">            socketChannel.socket().shutdownOutput();</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;channel.close();&#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="u5BA2_u6237_u7AEF"><a href="#u5BA2_u6237_u7AEF" class="headerlink" title="客户端"></a>客户端</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyClient</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="keyword">new</span> Thread(<span class="keyword">new</span> MyRunnable()).start();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">MyRunnable</span> <span class="keyword">implements</span> <span class="title">Runnable</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            SocketChannel socketChannel = <span class="keyword">null</span>;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                socketChannel = SocketChannel.open();</span><br><span class="line">                SocketAddress socketAddress = <span class="keyword">new</span> InetSocketAddress(<span class="string">"localhost"</span>, <span class="number">10000</span>);</span><br><span class="line">                socketChannel.connect(socketAddress);</span><br><span class="line"></span><br><span class="line">                sendFile(socketChannel, <span class="keyword">new</span> File(<span class="string">"c:/client_send.png"</span>));</span><br><span class="line">                receiveFile(socketChannel, <span class="keyword">new</span> File(<span class="string">"c:/client_receive.png"</span>));</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Exception ex) &#123;</span><br><span class="line">                ex.printStackTrace();</span><br><span class="line">            &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">                <span class="keyword">try</span> &#123;socketChannel.close();&#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">sendFile</span><span class="params">(SocketChannel socketChannel, File file)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">            FileChannel fileInChannel = <span class="keyword">null</span>;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                fileInChannel = <span class="keyword">new</span> FileInputStream(file).getChannel();</span><br><span class="line">                ByteBuffer buffer = ByteBuffer.allocateDirect(<span class="number">1024</span>);</span><br><span class="line">                <span class="keyword">int</span> size = <span class="number">0</span>;</span><br><span class="line">                <span class="keyword">while</span> ((size = fileInChannel.read(buffer)) != -<span class="number">1</span>) &#123;</span><br><span class="line">                    <span class="comment">//两个方法保证了buffer由写模式切换到读模式</span></span><br><span class="line">                    buffer.rewind();</span><br><span class="line">                    buffer.limit(size);</span><br><span class="line">                    socketChannel.write(buffer);</span><br><span class="line">                    buffer.clear();</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="comment">//上面代码可以优化为：fileInChannel.transferTo()</span></span><br><span class="line">                <span class="comment">//shutdownOutput用于关闭socket的输出流，对于一个tcp协议</span></span><br><span class="line">                <span class="comment">//之前写入的数据会被发送出去，接着发送tcp正常的连接终止信息</span></span><br><span class="line">                <span class="comment">//调用该方法后，如果仍然向socket写数据，则会抛出io异常</span></span><br><span class="line">                socketChannel.socket().shutdownOutput();</span><br><span class="line">            &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    fileInChannel.close();</span><br><span class="line">                &#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">receiveFile</span><span class="params">(SocketChannel socketChannel, File file)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">            FileChannel fileOutChannel = <span class="keyword">null</span>;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                fileOutChannel = <span class="keyword">new</span> FileOutputStream(file).getChannel();</span><br><span class="line">                ByteBuffer buffer = ByteBuffer.allocateDirect(<span class="number">1024</span>);</span><br><span class="line"></span><br><span class="line">                <span class="keyword">int</span> size = <span class="number">0</span>;</span><br><span class="line">                <span class="keyword">while</span> ((size = socketChannel.read(buffer)) != -<span class="number">1</span>) &#123;</span><br><span class="line">                    buffer.flip();</span><br><span class="line">                    <span class="keyword">if</span> (size &gt; <span class="number">0</span>) &#123;</span><br><span class="line">                        buffer.limit(size);</span><br><span class="line">                        fileOutChannel.write(buffer);</span><br><span class="line">                        buffer.clear();</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    fileOutChannel.close();</span><br><span class="line">                &#125; <span class="keyword">catch</span>(Exception ex) &#123;&#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　1. ServerSocketChannel只负责监听到客户端的连接<br>　　2. 在服务端，每次有客户端连接进来，则创建一个对应的SocketChannel，服务端采用该SocketChannel与该客户端通信<br>　　3. 针对不同客户端，服务端都会创建不同的SocketChannel，每个SocketChannel负责与各自的客户端连接通信<br>　　4. 该示例中，Selector只注册了一个ServerSocketChannel，创建的SocketChannel并未注册进去，这里未采用经典的reactor模式的。<br>　　5. 每次有新客户端的连接，都会导致ServerSocketChannel的interests变成OP_ACCEPT，与其注册到Selector时的interests匹配<br>源码下载地址：<a href="/code/socketchannel-copy.rar">socketchannel-copy.rar</a></p>
<h2 id="u53C2_u8003_u5730_u5740"><a href="#u53C2_u8003_u5730_u5740" class="headerlink" title="参考地址"></a>参考地址</h2><p><a href="http://blog.csdn.net/kongxx/article/details/7319410" target="_blank" rel="external">http://blog.csdn.net/kongxx/article/details/7319410</a></p>

      
    </div>
    <footer class="article-footer">
      <a data-url="http://yoursite.com/2015/12/23/nio/5.SocketChannel文件拷贝/" data-id="cijzzpv6q004w1cfsn7hwv3aa" class="article-share-link">Share</a>
      
      
  <ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/java/">java</a></li><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/socket/">socket</a></li></ul>

    </footer>
  </div>
  
    
<nav id="article-nav">
  
    <a href="/2015/12/23/nio/6.SocketChannel在线聊天/" id="article-nav-newer" class="article-nav-link-wrap">
      <strong class="article-nav-caption">Newer</strong>
      <div class="article-nav-title">
        
          SocketChannel在线聊天
        
      </div>
    </a>
  
  
    <a href="/2015/12/23/nio/4.FileChannel文件拷贝/" id="article-nav-older" class="article-nav-link-wrap">
      <strong class="article-nav-caption">Older</strong>
      <div class="article-nav-title">FileChannel文件拷贝</div>
    </a>
  
</nav>

  
</article>

</section>
        
          <aside id="sidebar">
  
    
  <div class="widget-wrap">
    <h3 class="widget-title">Categories</h3>
    <div class="widget">
      <ul class="category-list"><li class="category-list-item"><a class="category-list-link" href="/categories/cache/">cache</a><span class="category-list-count">3</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/database/">database</a><span class="category-list-count">13</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/docker/">docker</a><span class="category-list-count">6</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/gis/">gis</a><span class="category-list-count">4</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/git/">git</a><span class="category-list-count">2</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/go/">go</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/gradle/">gradle</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/groovy/">groovy</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/hadoop/">hadoop</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/java/">java</a><span class="category-list-count">18</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/linux/">linux</a><span class="category-list-count">4</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/log/">log</a><span class="category-list-count">11</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/mongodb/">mongodb</a><span class="category-list-count">14</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/mq/">mq</a><span class="category-list-count">6</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/mybatis/">mybatis</a><span class="category-list-count">9</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/netty/">netty</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/nginx/">nginx</a><span class="category-list-count">3</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/nio/">nio</a><span class="category-list-count">19</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/nodejs/">nodejs</a><span class="category-list-count">1</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/redis/">redis</a><span class="category-list-count">6</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/rpc/">rpc</a><span class="category-list-count">14</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/spring/">spring</a><span class="category-list-count">5</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/tomcat/">tomcat</a><span class="category-list-count">2</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/zookeeper/">zookeeper</a><span class="category-list-count">2</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/杂项/">杂项</a><span class="category-list-count">2</span></li></ul>
    </div>
  </div>

  
    
  <div class="widget-wrap">
    <h3 class="widget-title">Tags</h3>
    <div class="widget">
      <ul class="tag-list"><li class="tag-list-item"><a class="tag-list-link" href="/tags/aop/">aop</a><span class="tag-list-count">8</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/aspectj/">aspectj</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cache/">cache</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/classloader/">classloader</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/common-loggings/">common-loggings</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/commonjs/">commonjs</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/database/">database</a><span class="tag-list-count">10</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/">docker</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dubbo/">dubbo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/fastdfs/">fastdfs</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gclib/">gclib</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/geohash/">geohash</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gis/">gis</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/git/">git</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/go/">go</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gradle/">gradle</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/groovy/">groovy</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hadoop/">hadoop</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hessisan/">hessisan</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/">java</a><span class="tag-list-count">48</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/javassist/">javassist</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/kafka/">kafka</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/">linux</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/log/">log</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/log4j/">log4j</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/logback/">logback</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/map/">map</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/memecached/">memecached</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mina/">mina</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mongodb/">mongodb</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/">mq</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mqtt/">mqtt</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mybatis/">mybatis</a><span class="tag-list-count">9</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/netty/">netty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/">nginx</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nio/">nio</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nodejs/">nodejs</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/postgresql/">postgresql</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/protobuf/">protobuf</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/proxy/">proxy</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/push/">push</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/rabbitmq/">rabbitmq</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/">redis</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/rpc/">rpc</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sitemesh/">sitemesh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sld/">sld</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/slf4j/">slf4j</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/socket/">socket</a><span class="tag-list-count">7</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spatialite-for-android/">spatialite for android</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spi/">spi</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spring/">spring</a><span class="tag-list-count">13</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/tomcat/">tomcat</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/transaction/">transaction</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/web/">web</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/xSocket/">xSocket</a><span class="tag-list-count">7</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zbus/">zbus</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zookeeper/">zookeeper</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/数据结构/">数据结构</a><span class="tag-list-count">2</span></li></ul>
    </div>
  </div>

  
    
  <div class="widget-wrap">
    <h3 class="widget-title">Tag Cloud</h3>
    <div class="widget tagcloud">
      <a href="/tags/aop/" style="font-size: 15.38px;">aop</a> <a href="/tags/aspectj/" style="font-size: 11.54px;">aspectj</a> <a href="/tags/cache/" style="font-size: 11.54px;">cache</a> <a href="/tags/classloader/" style="font-size: 10px;">classloader</a> <a href="/tags/common-loggings/" style="font-size: 10px;">common-loggings</a> <a href="/tags/commonjs/" style="font-size: 12.31px;">commonjs</a> <a href="/tags/database/" style="font-size: 16.92px;">database</a> <a href="/tags/docker/" style="font-size: 13.85px;">docker</a> <a href="/tags/dubbo/" style="font-size: 10px;">dubbo</a> <a href="/tags/fastdfs/" style="font-size: 10px;">fastdfs</a> <a href="/tags/gclib/" style="font-size: 10.77px;">gclib</a> <a href="/tags/geohash/" style="font-size: 10px;">geohash</a> <a href="/tags/gis/" style="font-size: 10px;">gis</a> <a href="/tags/git/" style="font-size: 10.77px;">git</a> <a href="/tags/go/" style="font-size: 10px;">go</a> <a href="/tags/gradle/" style="font-size: 10px;">gradle</a> <a href="/tags/groovy/" style="font-size: 10px;">groovy</a> <a href="/tags/hadoop/" style="font-size: 10px;">hadoop</a> <a href="/tags/hessisan/" style="font-size: 11.54px;">hessisan</a> <a href="/tags/java/" style="font-size: 20px;">java</a> <a href="/tags/javassist/" style="font-size: 10px;">javassist</a> <a href="/tags/kafka/" style="font-size: 11.54px;">kafka</a> <a href="/tags/linux/" style="font-size: 12.31px;">linux</a> <a href="/tags/log/" style="font-size: 17.69px;">log</a> <a href="/tags/log4j/" style="font-size: 12.31px;">log4j</a> <a href="/tags/logback/" style="font-size: 13.08px;">logback</a> <a href="/tags/map/" style="font-size: 10px;">map</a> <a href="/tags/memecached/" style="font-size: 10.77px;">memecached</a> <a href="/tags/mina/" style="font-size: 13.08px;">mina</a> <a href="/tags/mongodb/" style="font-size: 19.23px;">mongodb</a> <a href="/tags/mq/" style="font-size: 13.85px;">mq</a> <a href="/tags/mqtt/" style="font-size: 10.77px;">mqtt</a> <a href="/tags/mybatis/" style="font-size: 16.15px;">mybatis</a> <a href="/tags/netty/" style="font-size: 10px;">netty</a> <a href="/tags/nginx/" style="font-size: 11.54px;">nginx</a> <a href="/tags/nio/" style="font-size: 13.08px;">nio</a> <a href="/tags/nodejs/" style="font-size: 10px;">nodejs</a> <a href="/tags/postgresql/" style="font-size: 10.77px;">postgresql</a> <a href="/tags/protobuf/" style="font-size: 10px;">protobuf</a> <a href="/tags/proxy/" style="font-size: 10px;">proxy</a> <a href="/tags/push/" style="font-size: 10px;">push</a> <a href="/tags/rabbitmq/" style="font-size: 11.54px;">rabbitmq</a> <a href="/tags/redis/" style="font-size: 13.85px;">redis</a> <a href="/tags/rpc/" style="font-size: 19.23px;">rpc</a> <a href="/tags/sitemesh/" style="font-size: 10px;">sitemesh</a> <a href="/tags/sld/" style="font-size: 10px;">sld</a> <a href="/tags/slf4j/" style="font-size: 10px;">slf4j</a> <a href="/tags/socket/" style="font-size: 14.62px;">socket</a> <a href="/tags/spatialite-for-android/" style="font-size: 10px;">spatialite for android</a> <a href="/tags/spi/" style="font-size: 10px;">spi</a> <a href="/tags/spring/" style="font-size: 18.46px;">spring</a> <a href="/tags/tomcat/" style="font-size: 10.77px;">tomcat</a> <a href="/tags/transaction/" style="font-size: 10px;">transaction</a> <a href="/tags/web/" style="font-size: 10px;">web</a> <a href="/tags/xSocket/" style="font-size: 14.62px;">xSocket</a> <a href="/tags/zbus/" style="font-size: 10px;">zbus</a> <a href="/tags/zookeeper/" style="font-size: 10.77px;">zookeeper</a> <a href="/tags/数据结构/" style="font-size: 10.77px;">数据结构</a>
    </div>
  </div>

  
    
  <div class="widget-wrap">
    <h3 class="widget-title">Archives</h3>
    <div class="widget">
      <ul class="archive-list"><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/01/">January 2016</a><span class="archive-list-count">67</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2015/12/">December 2015</a><span class="archive-list-count">81</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2015/11/">November 2015</a><span class="archive-list-count">2</span></li></ul>
    </div>
  </div>

  
    
  <div class="widget-wrap">
    <h3 class="widget-title">Recents</h3>
    <div class="widget">
      <ul>
        
          <li>
            <a href="/2016/01/30/资料/">(no title)</a>
          </li>
        
          <li>
            <a href="/2016/01/30/java/13.Classloader系列一/">ClassLoader系列一</a>
          </li>
        
          <li>
            <a href="/2016/01/29/hadoop/1.hadoop系列之源码编译/">hadoop系列一之源码编译</a>
          </li>
        
          <li>
            <a href="/2016/01/29/go/1.GO系列之入门/">Go系列一之入门</a>
          </li>
        
          <li>
            <a href="/2016/01/28/tomcat/2.tomcat性能优化/">tomcat性能优化</a>
          </li>
        
      </ul>
    </div>
  </div>

  
</aside>
        
      </div>
      <footer id="footer">
  
  <div class="outer">
    <div id="footer-info" class="inner">
      &copy; 2016 John Doe<br>
      Powered by <a href="http://hexo.io/" target="_blank">Hexo</a>
    </div>
  </div>
</footer>
    </div>
    <nav id="mobile-nav">
  
    <a href="/" class="mobile-nav-link">Home</a>
  
    <a href="/archives" class="mobile-nav-link">Archives</a>
  
</nav>
    


<script src="http://libs.baidu.com/jquery/2.0.3/jquery.min.js"></script>


  <link rel="stylesheet" href="/fancybox/jquery.fancybox.css" type="text/css">
  <script src="/fancybox/jquery.fancybox.pack.js" type="text/javascript"></script>


<script src="/js/script.js" type="text/javascript"></script>

  </div>
</body>
</html>